Creating a new world with addons while the screen of a previous modified world is still open causes the addons of the previous world to stay there

How to reproduce:

• Go to the create new world menu and select a marketplace world with addons
• Go to the behaviour pack list and click on an addon
• Click "More info", which will open the Marketplace
• Click "My Library" and select an addon and click "Activate Add-on!"
• Click the button to create a new world for the addon
• The addons of the previous world will be there and can't be disabled
  Creating the world will not keep the addons